text: from collections import OrderedDict
  
  from .common import EWSAccountService
  from ..util import create_element, set_xml_value, MNS
  
  
  class CreateItem(EWSAccountService):
      """Take a folder and a list of items. Return the result of creation as a list of tuples (success[True|False],
      errormessage), in the same order as the input list.
  
      MSDN: https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/createitem-operation
      """
  
      SERVICE_NAME = 'CreateItem'
      element_container_name = '{%s}Items' % MNS
  
      def call(self, items, folder, message_disposition, send_meeting_invitations):
          from ..folders import BaseFolder, FolderId
          from ..items import SAVE_ONLY, SEND_AND_SAVE_COPY, SEND_ONLY, \
              SEND_MEETING_INVITATIONS_CHOICES, MESSAGE_DISPOSITION_CHOICES
          if message_disposition not in MESSAGE_DISPOSITION_CHOICES:
              raise ValueError("'message_disposition' %s must be one of %s" % (
                  message_disposition, MESSAGE_DISPOSITION_CHOICES
              ))
          if send_meeting_invitations not in SEND_MEETING_INVITATIONS_CHOICES:
              raise ValueError("'send_meeting_invitations' %s must be one of %s" % (
                  send_meeting_invitations, SEND_MEETING_INVITATIONS_CHOICES
              ))
          if folder is not None:
              if not isinstance(folder, (BaseFolder, FolderId)):
                  raise ValueError("'folder' %r must be a Folder or FolderId instance" % folder)
              if folder.account != self.account:
                  raise ValueError('"Folder must belong to this account')
          if message_disposition == SAVE_ONLY and folder is None:
              raise AttributeError("Folder must be supplied when in save-only mode")
          if message_disposition == SEND_AND_SAVE_COPY and folder is None:
              folder = self.account.sent  # 'Sent' is default EWS behaviour
          if message_disposition == SEND_ONLY and folder is not None:
              raise AttributeError("Folder must be None in send-ony mode")
          return self._elems_to_objs(self._chunked_get_elements(
              self.get_payload,
              items=items,
              folder=folder,
              message_disposition=message_disposition,
              send_meeting_invitations=send_meeting_invitations,
          ))
  
      def _elems_to_objs(self, elems):
          from ..items import BulkCreateResult
          for elem in elems:
              if isinstance(elem, (Exception, type(None))):
                  yield elem
                  continue
              yield BulkCreateResult.from_xml(elem=elem, account=self.account)
  
      def get_payload(self, items, folder, message_disposition, send_meeting_invitations):
          """Take a list of Item objects (CalendarItem, Message etc) and return the XML for a CreateItem request.
          convert items to XML Elements.
  
          MessageDisposition is only applicable to email messages, where it is required.
  
          SendMeetingInvitations is required for calendar items. It is also applicable to tasks, meeting request
          responses (see
          https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/createitem-operation-meeting-request
          ) and sharing
          invitation accepts (see
          https://docs.microsoft.com/en-us/exchange/client-developer/web-service-reference/createitem-acceptsharinginvitation
          ). The last two are not supported yet.
  
          :param items:
          :param folder:
          :param message_disposition:
          :param send_meeting_invitations:
          """
          createitem = create_element(
              'm:%s' % self.SERVICE_NAME,
              attrs=OrderedDict([
                  ('MessageDisposition', message_disposition),
                  ('SendMeetingInvitations', send_meeting_invitations),
              ])
          )
          if folder:
              saveditemfolderid = create_element('m:SavedItemFolderId')
              set_xml_value(saveditemfolderid, folder, version=self.account.version)
              createitem.append(saveditemfolderid)
          item_elems = create_element('m:Items')
          for item in items:
              if not item.account:
                  item.account = self.account
              set_xml_value(item_elems, item, version=self.account.version)
          if not len(item_elems):
              raise ValueError('"items" must not be empty')
          createitem.append(item_elems)
          return createitem
  